Jun/Jul 2008

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Finding Pulley Sizes

By Del Agerton

3952 Norman Road Clarkston, Georgia 30021

This is some information which I thought might be interesting and helpful to people who like to "belt" their engines to various equipment. A friend of mine recently belted two of his engines to some hammermills he had acquired. When I asked him how fast he was turning the mills, he said, "I don't know, I just found some pulleys that made them sound right." That is one way and he has two nice hammermills. However, I proceeded to explain how to determine pulley sizes and RPM. With my shaft tachometer I checked the engine RPM (no center hole in mill shaft) and computed the mill speed at 1821 RPM using the pulley sizes. This procedure is explained on the attached sheet.

My interest comes from my experiences around my dad's sawmill and shop. There we had numerous occasions to use such equipment as the...

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